Checking The Magnesium Anode; Check The Top Magnesium Anode (Su80/5, Su100/5); Check The Top Magnesium Anode (Su54/5); Check The Side Magnesium Anode (Su80/5, Su100/5) - Buderus SU80/5 Installation And Maintenance Instructions Manual

9.3

Checking the magnesium anode

If the magnesium anode is not serviced properly, the
warranty is void.
Annual service records must be kept in a safe location
and submitted together with the original purchase
receipt in the event of a warranty claim.
The magnesium anode protects the DHW tank from corrosion. Check the
magnesium anode annually to determine whether it needs to be
changed.
The surface of the magnesium anode must be free of deposits. Exchange
the magnesium anode when deposits collect, the surface is enlarged
from deposits, or the diameter is less than 5/8" (15 mm).
Certain installations may require more frequent replacement of the
magnesium anode rod:
• Recirculation connection
• Poor water quality
• Galvanic/electrolytic corrosion
• High flow rate
In the event of poor water quality it is recommended that a water
treatment professional be consulted for water treatment options.
Never bring the magnesium anode surface in contact
with oil or grease.
▶ Keep everything clean.

9.3.1 Check the top magnesium anode (SU80/5, SU100/5)

▶ Remove PS top cover if not already removed.
▶ Unscrew the magnesium anodes.
▶ Check the magnesium anodes for decomposition.
▶ If the diameter has decreased to about 5/8 " (15 mm), exchange the
magnesium anode.
▶ Screw the magnesium anodes back into the sleeve.
Fig. 20 Check the top magnesium anode (SU80/5, SU100/5)
[1] Hex bolt
[2] Magnesium anode
SU54.5 | SU80.5 | SU100.5 – 6 720 819 292 (2017/11)

9.3.2 Check the top magnesium anode (SU54/5)

▶ Remove the cleanout cover ( Fig. 17, page 14), if not yet removed.
▶ Check the magnesium anodes.
▶ If the diameter has decreased to about 5/8 " (15 mm), exchange the
magnesium anode.
▶ Unscrew the nut M8 [9] to release the eyelet of the grounding cable
connecting lead[8].
▶ Unscrew the M8 nut [7].
▶ Remove the handhole cover [3] from the magnesium anode [1].
▶ Install the new magnesium anode with the provided small parts
( Fig. 21).
Fig. 21 Replacing the magnesium anode
[1] Magnesium anode
[2] Gasket
[3] Handhole cover
[4] Insulating sleeve
[5] U-washer
[6] Serrated washer
[7] M8 Nut
[8] Eyelet of the grounding cable connecting lead
[9] M8 Nut
9.3.3 Check the side magnesium anode
(SU80/5, SU100/5)
▶ Empty the tank as described in chapter 9.1, page 13.
▶ Remove the cleanout cover ( Fig. 17, page 14), if not yet removed.
▶ Check the magnesium anodes.
▶ If the diameter has decreased to about ½ " (15 mm), exchange the
magnesium anode.
▶ Unscrew the nut M8 [9] to release the eyelet of the grounding cable
connecting lead[8].
▶ Unscrew the M8 nut [7].
▶ Remove the handhole cover [3] from the magnesium anode [1].
▶ Install the new magnesium anode with the provided small parts
( Fig. 21).
9
Maintenance
15